not sure if switching to this epoll actually helped

overlay/eventfd/eventfd.go

@@ -0,0 +1,91 @@
+package eventfd
+
+import (
+	"encoding/binary"
+	"syscall"
+
+	"golang.org/x/sys/unix"
+)
+
+type EventFD struct {
+	fd  int
+	buf [8]byte
+}
+
+func New() (EventFD, error) {
+	fd, err := unix.Eventfd(0, unix.EFD_NONBLOCK)
+	if err != nil {
+		return EventFD{}, err
+	}
+	return EventFD{
+		fd:  fd,
+		buf: [8]byte{},
+	}, nil
+}
+
+func (e *EventFD) Kick() error {
+	binary.LittleEndian.PutUint64(e.buf[:], 1) //is this right???
+	_, err := syscall.Write(int(e.fd), e.buf[:])
+	return err
+}
+
+func (e *EventFD) Close() error {
+	if e.fd != 0 {
+		return unix.Close(e.fd)
+	}
+	return nil
+}
+
+func (e *EventFD) FD() int {
+	return e.fd
+}
+
+type Epoll struct {
+	fd     int
+	buf    [8]byte
+	events []syscall.EpollEvent
+}
+
+func NewEpoll() (Epoll, error) {
+	fd, err := unix.EpollCreate1(0)
+	if err != nil {
+		return Epoll{}, err
+	}
+	return Epoll{
+		fd:     fd,
+		buf:    [8]byte{},
+		events: make([]syscall.EpollEvent, 1),
+	}, nil
+}
+
+func (ep *Epoll) AddEvent(fdToAdd int) error {
+	event := syscall.EpollEvent{
+		Events: syscall.EPOLLIN,
+		Fd:     int32(fdToAdd),
+	}
+	return syscall.EpollCtl(ep.fd, syscall.EPOLL_CTL_ADD, fdToAdd, &event)
+}
+
+func (ep *Epoll) Block() (int, error) {
+	n, err := syscall.EpollWait(ep.fd, ep.events, -1)
+	if err != nil {
+		//goland:noinspection GoDirectComparisonOfErrors
+		if err == syscall.EINTR {
+			return 0, nil //??
+		}
+		return -1, err
+	}
+	return n, nil
+}
+
+func (ep *Epoll) Clear() error {
+	_, err := syscall.Read(int(ep.events[0].Fd), ep.buf[:])
+	return err
+}
+
+func (ep *Epoll) Close() error {
+	if ep.fd != 0 {
+		return unix.Close(ep.fd)
+	}
+	return nil
+}